CVE-2021-47066

01/תיאור (מקור, אנגלית)

In the Linux kernel, the following vulnerability has been resolved: async_xor: increase src_offs when dropping destination page Now we support sharing one page if PAGE_SIZE is not equal stripe size. To support this, it needs to support calculating xor value with different offsets for each r5dev. One offset array is used to record those offsets. In RMW mode, parity page is used as a source page. It sets ASYNC_TX_XOR_DROP_DST before calculating xor value in ops_run_prexor5. So it needs to add src_list and src_offs at the same time. Now it only needs src_list. So the xor value which is calculated is wrong. It can cause data corruption problem. I can reproduce this problem 100% on a POWER8 machine. The steps are: mdadm -CR /dev/md0 -l5 -n3 /dev/sdb1 /dev/sdc1 /dev/sdd1 --size=3G mkfs.xfs /dev/md0 mount /dev/md0 /mnt/test mount: /mnt/test: mount(2) system call failed: Structure needs cleaning.

02/מוצרים מושפעים

linux: linux kernel

03/קישורים8

• git.kernel.org/stable/c/29ffa50f33de824b5491f8239c88c4a0efdd03af Patch
• git.kernel.org/stable/c/53f8208e11abd6dde9480dfcb97fecdb1bc2ac18 Patch
• git.kernel.org/stable/c/cab2e8e5997b592fdb7d02cf2387b4b8e3057174 Patch
• git.kernel.org/stable/c/ceaf2966ab082bbc4d26516f97b3ca8a676e2af8 Patch
• git.kernel.org/stable/c/29ffa50f33de824b5491f8239c88c4a0efdd03af Patch
• git.kernel.org/stable/c/53f8208e11abd6dde9480dfcb97fecdb1bc2ac18 Patch
• git.kernel.org/stable/c/cab2e8e5997b592fdb7d02cf2387b4b8e3057174 Patch
• git.kernel.org/stable/c/ceaf2966ab082bbc4d26516f97b3ca8a676e2af8 Patch